Added sprite randomizer for grass and simple Z sorting for moving objects.

Assets/prefabs/Environment/GrassTile.prefab.meta

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Assets/script/RandomSprite.cs

+using UnityEngine;
+using System.Collections;
+
+public class RandomSprite : MonoBehaviour {
+
+    public Sprite[] tiles;
+
+	// Use this for initialization
+	void Start () {
+        GetComponent<SpriteRenderer>().sprite = tiles[Random.Range(0, tiles.Length)];
+    }
+}

Assets/script/RandomSprite.cs.meta

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Assets/script/ZSort.cs

+using UnityEngine;
+using System.Collections;
+
+public class ZSort : MonoBehaviour {
+
+    private SpriteRenderer sr;
+    private float offset = 0;
+
+	void Start () {
+        sr = GetComponent<SpriteRenderer>();
+        if (sr) {
+            sr.sortingLayerName = "Moving";
+            offset = sr.sprite.bounds.extents.y;
+        }
+	}
+	
+	void LateUpdate () {
+        if (sr) {
+            sr.sortingOrder = (int)((transform.position.y - offset) * -100);
+        }
+	}
+}

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